Wetland-driven shifts in suspended particulate organic matter composition of the Hudson River estuary, New York
Wetland-driven shifts in suspended particulate organic matter composition of the Hudson River estuary, New York
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DOI：
10.4319/lo.2010.55.4.1653
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发表时间：
2010-07-01
影响因子：
4.5
通讯作者：
Fischer, David T.
中科院分区：
文献类型：
--
作者：
Hunsinger, Glendon B.;Mitra, Siddhartha;Fischer, David T.
元素碳和氮，稳定同位素，和木质素酚之间的蒂沃利湾湿地和淡水潮汐哈德逊河口（HRE）的主干跨潮汐周期，在2006年和2007年每月在一年中的无冰部分悬浮颗粒物交换进行了量化。有机质（OM）组成的时间变化范围为33.1 ~ 247.6 mg g（-1）颗粒有机碳（POC），POC的稳定碳同位素特征为-34.7%~-27.2（δ（13）C（POC））、~ 3.6%至13.6%的颗粒氮的氮同位素特征（δ（15）N（PN））和0.8至25.0 mg/100 mg OC木质素酚。从5月到8月，湿地转移了丰富的（高达247.6毫克g（-1）），化学特征（三角洲（13）C（POC）为-34.7%）的颗粒OM的HRE，特别是Tivoli南湾。我们估计，从蒂沃利海湾到HRE的POC净输出量> 60 Mg km（-2）yr（-1）。混合模型的迭代表明，在夏季的主要来源（50%至86%），而在其他季节的外来和外来OM的贡献大致相当（类似于38%）。两者合计，地球化学数据和混合建模强调的功能和价值的HRE潮汐湿地组成独特的和不稳定的POC河口碳预算的主要发电机。在更广泛的背景下，横向水生连接与潮汐湿地在季节性或本地化的规模可能会掩盖内部或高地的影响OM组成，生产和加工河口，一个潜在的，但关键的考虑因素时，破译的时间和纵向趋势。
Elemental carbon and nitrogen, stable isotopes, and lignin phenols were quantified for suspended particulate material exchanging between Tivoli Bays wetlands and the main stem of the freshwater-tidal Hudson River estuary (HRE) across a tidal cycle, seasonally in 2006 and monthly in 2007 during the ice-free portion of the year. Temporal shifts in organic matter (OM) composition ranged from 33.1 to 247.6 mg g(-1) particulate organic carbon (POC), -34.7% to -27.2% stable carbon isotopic signature of POC (delta(13)C(POC)), -3.6% to 13.6% nitrogen isotopic signature of particulate nitrogen (delta(15)N(PN)), and 0.8 to 25.0 mg per 100 mg OC lignin phenols. From May to August, the wetlands transferred abundant (up to 247.6 mg g(-1)), chemically distinctive (delta(13)C(POC) as depleted as -34.7%) particulate OM to the HRE, particularly Tivoli South Bay. We estimated a net export of > 60 Mg km(-2) yr(-1) POC from Tivoli Bays into the HRE. Mixing model iterations indicated that planktonic OM was the dominant source (50% to 86%) during summertime, while contributions from allochthonous and planktonic OM during other seasons were roughly equivalent (similar to 38%). Taken together, both geochemical data and mixing modeling underscore the function and value of HRE tidal wetlands as major generators of compositionally unique and labile POC for the estuarine carbon budget. In a broader context, lateral aquatic connections with tidal wetlands at seasonal or localized scales may overshadow internal or upland influences on OM composition, production, and processing in estuaries; a latent but key consideration when deciphering temporal and longitudinal trends.